Add Dispatcher class to the Battery Status API module.

Source/modules/battery/BatteryManager.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BatteryManager_h
 #define BatteryManager_h
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/Document.h"
 #include "core/events/EventTarget.h"
+#include "core/frame/DeviceSensorEventController.h"
 #include "heap/Handle.h"
-#include "modules/battery/BatteryStatus.h"
 
 namespace WebCore {
 
 class Navigator;
 
-class BatteryManager FINAL : public RefCountedWillBeRefCountedGarbageCollected<BatteryManager>, public ContextLifecycleObserver, public EventTargetWithInlineData {
+class BatteryManager FINAL : public RefCountedWillBeRefCountedGarbageCollected<BatteryManager>, public ActiveDOMObject, public DeviceSensorEventController, public EventTargetWithInlineData {
     DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<BatteryManager>);
 public:
     virtual ~BatteryManager();
     static PassRefPtrWillBeRawPtr<BatteryManager> create(ExecutionContext*);
 
     // EventTarget implementation.
     virtual const WTF::AtomicString& interfaceName() const OVERRIDE { return EventTargetNames::BatteryManager; }
     virtual ExecutionContext* executionContext() const OVERRIDE { return ContextLifecycleObserver::executionContext(); }
 
     bool charging();
     double chargingTime();
     double dischargingTime();
     double level();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(chargingchange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(chargingtimechange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(dischargingtimechange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(levelchange);
 
-    void didChangeBatteryStatus(PassRefPtrWillBeRawPtr<Event>, PassOwnPtr<BatteryStatus>);
+    void didChangeBatteryStatus(PassRefPtrWillBeRawPtr<Event>);
+
+    // ActiveDOMObject implementation.
+    virtual bool canSuspend() const { return true; }
+    virtual void suspend() OVERRIDE;
+    virtual void resume() OVERRIDE;
+    virtual void stop() OVERRIDE;
+
+    // DeviceSensorEventController
+    virtual void registerWithDispatcher() OVERRIDE;
+    virtual void unregisterWithDispatcher() OVERRIDE;
+    virtual bool hasLastData() OVERRIDE;
+    virtual PassRefPtrWillBeRawPtr<Event> getLastEvent() OVERRIDE;
+    virtual bool isNullEvent(Event*) OVERRIDE;
 
     void trace(Visitor*) { }
 
 private:
     explicit BatteryManager(ExecutionContext*);
-
-    OwnPtr<BatteryStatus> m_batteryStatus;
 };
 
 }
 
 #endif // BatteryManager_h